DECO PERIOD PLATINUM 1.72 CT DIAMOND RING: Ca. 1920's. Platinum diamond ring contains one old European round cut diamond. WEIGHT: .86 Ct. Approx. Rated VS1 in clarity and J in color. Twelve old mine cut, old European round cut and single cut diamonds. WEIGHT: .86 Ct. Approx. The small diamonds average VS-SI in clarity and I-J in color. The diamonds are prong set. Weight: 4.6 grams. Size: 4.5